Re: [Xen-devel] [PATCH] xend: Do not mess with bridge if admin has set one up already

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2010-06-14 at 16:07 +0100, Ian Jackson wrote:
> Previously, the default "network-script",
> /etc/xen/scripts/network-bridge, would attempt to do its horrid work
> even if you had already set everything up in /etc/network/interfaces.

I like it. One of the first patches I apply to any newly cloned Xen tree
is:

diff -r 2d74cb5f973f -r ed212583c51b tools/examples/xend-config.sxp
--- a/tools/examples/xend-config.sxp    Thu Jun 10 10:19:26 2010 +0100
+++ b/tools/examples/xend-config.sxp    Fri Jun 11 11:01:02 2010 +0100
@@ -154,7 +154,7 @@
 # two fake interfaces per guest domain.  To do things like this, write
 # yourself a wrapper script, and call network-bridge from it, as appropriate.
 #
-(network-script network-bridge)
+#(network-script network-bridge)
 
 # The script used to control virtual interfaces.  This can be overridden on a
 # per-vif basis when creating a domain or a configuring a new vif.  The

Which is slightly more aggressive.

> Setting up your bridge in /etc/network/interfaces is:
>  * easy

FWIW I typically use a stanza like:
        iface xenbr0 inet dhcp
                bridge_ports eth0
                bridge_stp off
                bridge_waitport 0
                bridge_fd 0
                bridge_maxwait 0
        
I think only bridge_ports is strictly required but the others are
useful. As you note in the patch the bridge-utils-interfaces(5) manpage
describes the available settings.

Ian.


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